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A simple selective colorimetric and fluorimetric chemosensor RD based on Rhodamine B hydrazone derivatives was designed and synthesized, which showed both colorimetric and fluorescence responses for cyanide and Cu 2+ in aqueous solution with specific selectivity and high sensitivity. In the presence of cyanide, the sensor exhibited a visible color change from colorless to pale yellow by naked-eyes and rapidly produced a strong yellow fluorescence in aqueous solution. The detection limit on fluorescence response of RD sensor to CN - is down to 3.54×10 -7 M. In addition, compared to other metal ions such as Fe 3+ , Hg 2+ , Ag + , Ca 2+ , Cu 2+ , Co 2+ , Ni 2+ , Cd 2+ , Pb 2+ , Cr 3+ , Zn 2+ and Mg 2+ in aqueous solutions, RD could show both colorimetric and fluorescence responses rapidly for Cu 2+ . Notably, this sensor can be used as a molecular switch controlled by CN - and H + cyclically. Test strips based on RD were fabricated that could be used as a convenient and efficient CN - and Cu 2+ test kits. RD could detect cyanide in germinated potato, bitter almond and tap water. This chemosensor enabled detection of two ions, which do not need to rely on two different sensors., (Copyright © 2019. Published by Elsevier B.V.)

In this paper, we have designed and synthesized a novel sensor L1 based on asymmetric double-azine derivatives, which showed both "naked eye" recognition and fluorescence responses for CN - in DMSO/H 2 O (v/v=4:1, pH=7.20) solution. This simple sensor L1 could distinguish CN - from coexisting anions via the way of deprotonation and sensing mechanism of intramolecular charge transfer (ICT), and the minimum detection limit on fluorescence response of the sensor L1 towards CN - was down to 9.47×10 -7 M. Moreover, we have successfully utilized the sensor L1 to detect CN - in bitter almond. Test strips containing L1 were also prepared, which could act as a practical colorimetric tool to detect CN - in aqueous media., (Copyright © 2017 Elsevier B.V. All rights reserved.)

A novel cyanide selective fluorescent chemosensor S1 based on benzimidazole group and naphthalene group as the fluorescence signal group had been designed and synthesized. The receptor could instantly detect CN(-) anion over other anions such as F(-), Cl(-), Br(-), I(-), AcO(-), H2PO4(-), HSO4(-), SCN(-) and ClO4(-) by fluorescence spectroscopy changes in aqueous solution (H2O/DMSO, 8:2, v/v) with specific selectivity and high sensitivity. The fluorescence color of the solution containing sensor S1 induced a remarkable color change from pale blue to mazarine only after the addition of CN(-) in aqueous solution while other anions did not cause obvious color change. Moreover, further study demonstrates the detection limit on fluorescence response of the sensor to CN(-) is down to 8.8×10(-8)M, which is far lower than the WHO guideline of 1.9×10(-6)M. Test strips based on S1 were fabricated, which could act as a convenient and efficient CN(-) test kit to detect CN(-) in pure water for "in-the-field" measurement. Thus, the probe should be potential applications in an aqueous environment for the monitoring of cyanide., (Copyright © 2014 Elsevier B.V. All rights reserved.)

We designed and synthesized a carboxylic acid-functionalized coumarin derivative sensor F3, which has a dual-channel response to CN− in DMSO/H2O (2:3, v/v) solution with a fluorescence detection limit of 3.09 × 10–8 M. After adding AcOH to F3-CN system, the fluorescence of the system recovered to its initial state, so F3 is a reversible fluorescence chemical sensor. Based on this, we applied it to the ultrasensitive IMPLICATION logic gate. In addition, we made a test strips that can be used to quickly and conveniently detect CN−. According to various characteristics and applications of F3, it can be concluded that sensor F3 is a promising sensor. The detection methods have strong anti-interference ability, convenient use, fast response speed and low detection limit. [ABSTRACT FROM AUTHOR]

A novel highly selective chemosensor S1 for cyanide based on unsymmetrical azine derivative was successfully designed and synthesized, which showed both colorimetric and fluorescence turn-on responses for cyanide ions in aqueous. This structurally simple chemosensor could detect CN − anion over other anions in aqueous solution DMSO/H 2 O (v/v = 3:2) undergo deprotonation reaction. Results showed that the chemosensor S1 exhibited 50 fold enhancement in fluorescence at 530 nm and showed an obvious change in color from colorless to yellow that could be detected by naked eye under the UV-lamp after the addition of CN − in aqueous solution. Moreover, the detection limit on fluorescence response of the sensor to CN − is down to 6.17 × 10 − 8 M by titration method. Test strips based on S1 were obtain, which could be used as a convenient and efficient CN − test kit to detect CN − in aqueous solution. [ABSTRACT FROM AUTHOR]